frequency analysis

(David Kelliher) - I had a look at case number 43 from Tuesday Jan 24th . In this case the entire signal was stored from before injection to the end of the cycle. The beam was adiabatically debunched, coasting for sometime, and then rebunched and reaccelerated.

In the left figure below the FAB and RF signals are shown. There is no subtraction of a "no beam" case here. The right figure shows the spectrogram with 125 MHz sampling frequency. The RF harmonics are clearly visibile along with other fixed frequency signals with narrow or broad frequency ranges that span the entire cycle (including before and after injection and while the beam is coasting).